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Chapter 13 Remote Management
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116
13.1.1
Remote Management Limitations
Remote management over LAN or WAN will not work when:
1
You have disabled that service in one of the remote management screens.
2
The IP address in the
Secured Client WAN IP Address
field does not match the client IP address.
If it does not match, the NBG-418N will disconnect the session immediately.
3
There is already another remote management session with an equal or higher priority running. You
may only have one remote management session running at one time.
4
There is a firewall rule that blocks it.
13.1.2
Remote Management and NAT
When NAT is enabled:
Use the NBG-418N’s WAN IP address when configuring from the WAN.
Use the NBG-418N’s LAN IP address when configuring from the LAN.
13.1.3
System Timeout
There is a default system management idle timeout of five minutes (three hundred seconds). The
NBG-418N automatically logs you out if the management session remains idle for longer than this
timeout period. The management session does not time out when a statistics screen is polling. You
can change the timeout period in the
System
screen.
13.2
WWW Screen
To change your NBG-418N’s World Wide Web settings, click
Management
>
Remote MGMT
to
display the
WWW
screen.
Figure 81
Management > Remote MGMT > WWW
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The following table describes the labels in this screen.
Table 51
Management > Remote MGMT > WWW
LABEL
DESCRIPTION
Server Port
You may change the server port number for a service if needed, however you must
use the same port number in order to use that service for remote management.
Server Access
Select the interface(s) through which a computer may access the NBG-418N using
this service.
Secured Client WAN IP
Address
A secured client is a “trusted” computer that is allowed to communicate with the
NBG-418N using this service.
Select
All
to allow any computer to access the NBG-418N using this service.
Choose
Selected
to just allow the computer with the IP address that you specify to
access the NBG-418N using this service.
Note: This only applies on WAN IP.
Apply
Click
Apply
to save your customized settings and exit this screen.
Reset
Click
Reset
to begin configuring this screen afresh.
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Chapter 13 Remote Management
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119
C
HAPTER
14
Universal Plug-and-Play (UPnP)
14.1
Overview
This chapter introduces the UPnP feature in the Web Configurator.
Universal Plug and Play (UPnP) is a distributed, open networking standard that uses TCP/IP for
simple peer-to-peer network connectivity between devices. A UPnP device can dynamically join a
network, obtain an IP address, convey its capabilities and learn about other devices on the network.
In turn, a device can leave a network smoothly and automatically when it is no longer in use.
14.2
What You Need to Know
How do I know if I'm using UPnP?
UPnP hardware is identified as an icon in the Network Connections folder (Windows XP). Each UPnP
compatible device installed on your network will appear as a separate icon. Selecting the icon of a
UPnP device will allow you to access the information and properties of that device.
NAT Traversal
UPnP NAT traversal automates the process of allowing an application to operate through NAT. UPnP
network devices can automatically configure network addressing, announce their presence in the
network to other UPnP devices and enable exchange of simple product and service descriptions.
NAT traversal allows the following:
Dynamic port mapping
Learning public IP addresses
Assigning lease times to mappings
Windows Messenger is an example of an application that supports NAT traversal and UPnP.
See the NAT chapter for more information on NAT.
Cautions with UPnP
The automated nature of NAT traversal applications in establishing their own services and opening
firewall ports may present network security issues. Network information and configuration may also
be obtained and modified by users in some network environments.
When a UPnP device joins a network, it announces its presence with a multicast message. For
security reasons, the NBG-418N allows multicast messages on the LAN only.
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Chapter 14 Universal Plug-and-Play (UPnP)
NBG-418N User’s Guide
120
All UPnP-enabled devices may communicate freely with each other without additional configuration.
Disable UPnP if this is not your intention.
14.3
Configuring UPnP
Use this screen to enable UPnP. Click the
Management > UPnP
to open the following screen.
Figure 82
Management > UPnP > General
The following table describes the labels in this screen.
14.3.1
Using UPnP in Windows XP Example
This section shows you how to use the UPnP feature in Windows XP. You must already have UPnP
installed in Windows XP and UPnP activated on the NBG-418N.
Make sure the computer is connected to a LAN port of the NBG-418N. Turn on your computer and
the NBG-418N.
14.3.1.1
Auto-discover Your UPnP-enabled Network Device
1
Click
start
and
Control Panel
. Double-click
Network Connections
. An icon displays under
Internet Gateway.
Table 52
Management > UPnP > General
LABEL
DESCRIPTION
Enable the Universal Plug
and Play (UPnP) Feature
Select this check box to activate UPnP. Be aware that anyone could use a UPnP
application to open the Web Configurator's login screen without entering the
NBG-418N's IP address (although you must still enter the password to access
the Web Configurator).
Allow users to make port
forwarding changes through
UPnP
Select this check box to allow UPnP-enabled applications to automatically
configure the NBG-418N so that they can communicate through the NBG-418N,
for example, by using NAT traversal. UPnP applications automatically reserve a
NAT forwarding port in order to communicate with another UPnP enabled
device. this eliminates the need to manually configure port forwarding for the
UPnP enabled application.
Apply
Click
Apply
to save the setting to the NBG-418N.
Reset
Click
Reset
to begin configuring this screen afresh.

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